Status leds – Rockwell Automation 1747-DSN DISTRIBUTED I/O SCANNER User Manual
Page 36

Chapter 4
Operation and Troubleshooting
4–6
The scanner has two LEDs that indicate its operating status, FAULT and
COMM. The FAULT LED indicates the scanner’s overall status. The
COMM LED indicates the DIO Link communications status.
The FAULT LED is off whenever the scanner is operating properly. The
COMM LED state is valid only when the FAULT LED is off.
The table below provides the scanner and communications status as indicated
by the FAULT and COMM LEDs.
FAULT LED
COMM LED
Status Information
Flashing Red
Don’t care
Scanner configuration error
No network communication attempted
Duplicate scanner detected on network
Solid Red
Don’t care
Major fault on scanner
No network communication attempted
Off
Solid Red
Hardware fault detected
Off
Off
Scanner is operating properly
Scanner is offline (no network communication
attempted)
Off
Solid Green
Scanner is operating properly
Scanner is online (active communication
established with all I/O blocks)
Off
Flashing Green
Scanner is operating properly
At least one configured I/O block is not
communicating
Off
Flashing Red
Scanner is operating properly
None of the configured I/O blocks are
communicating
Status LEDs
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